涂层失效一般是由涂层与基底界面的显微组织演变引起的,对高温下含纳米Ni粉的陶瓷涂层与合金组织的演变进行了研究,结果表明:陶瓷涂层/合金试样在900 ℃下进行真空扩散退火后,合金基底内在靠近界面的附近依次出现了Al_2O_3的晶间氧化物和针状TiN氮化物析出层;在长时间扩散过程中,纳米镍粉逐渐聚集长大,与合金基底在界面处融为一体,形成涂层与基体的咬合,使涂层与基体的结合趋向于冶金结合,具有抑制涂层失效的作用.
The failure of coatings is mainly caused by the behavior of microstructure on interface of the coating and substrate.The behavior of microstructure on interface of high-temperature ceramic coating containing nano-size nickel powder and super alloy GH202 during vacuum diffusion was studied. The results show that Al_2O_3 oxide layer and Ti, N compound exist respectively in the alloy substrate close to interface. During long time diffusion, nano-size nickel powders gradually congregate and grow up, and the confluent interface appeares, which shows that the nano-size nickel powders have the effect of restraining the coating from failure.
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